1.2 School Trip 
Teacher's
page

You are about to go on a field trip with the entire school. There are 438 teachers, students, and administrators in your building. Everyone will be traveling by school bus. If each bus (excluding the bus driver) can seat a maximum of 30 people, how many buses will you need to transport everyone 
Software:
Clarisworks.
Can also be shown as a transparency on an overhead projector.
Environment: One computer classroom (see resource page ) Level: Strategy: GEPA Connections: 
Setting the Stage

Debrief Understanding the sign is a prerequisite for realizing that finding a sum for this problem does not make sense. For example, students could be asked what 3 apples + 5 shoes + 7 doornobs equals? They might be tempted to say "15 items" which could be argued as correct. But the overriding question of whether it makes sense to do this addition is the main point of this discussion. 